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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

27921 results found.

  1. GRB 091109: Swift-BAT refined analysis
  2. GRB 091109: Enhanced Swift-XRT position
  3. GRB091109: REM detection of the NIR afterglow
  4. GRB 091109: Swift detection of a burst with optical afterglow
  5. GRB 091029: Observations from Stardome Observatory
  6. GRB 091104: Swift-BAT refined analysis
  7. GRB 091104: Swift XRT Refined Analysis
  8. GRB 091104: Swift/UVOT Upper Limits
  9. GRB091026 : IRSF NIR upper limit
  10. GRB091102 : MOA optical upper limit
  11. GRB 091104: Enhanced Swift-XRT position
  12. GRB 091104: Swift detection of a burst
  13. Fermi LAT Upper Limits on GRB 091010
  14. GRB 091102 : Faulkes Telescope South Upper Limits
  15. GRB 091102A: Fermi GBM observation
  16. GRB 091102: Swift-XRT refined analysis
  17. GRB 091102: Swift/UVOT Upper Limits
  18. GRB 091102: GROND Upper Limits
  19. GRB 091102: BOOTES-3 observations
  20. GRB 091102: Swift-BAT refined analysis
  21. GRB 091102: Swift/XRT localization
  22. GRB 091102: ROTSE-III Optical Limits
  23. GRB 091102: Swift/UVOT Finding Chart Observation
  24. GRB 091102: Swift detection of a burst
  25. GRB 091024: optical observations
  26. GRB 091031: Fermi GBM detection
  27. GRB 091024: Fermi LAT upper limits
  28. GRB 090920: Skynet/DSO Detection
  29. GRB091029: Swift/UVOT observations
  30. GRB 091029: Swift XRT refined analysis
  31. GRB 091029: Swift-BAT refined analysis
  32. GRB 091029: Enhanced Swift-XRT position
  33. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  34. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  35. GRB 091029: Swift detection of a burst with an optical counterpart
  36. A mistake in testing a new function in Swift
  37. GRB 091020: Fermi GBM observation
  38. GRB 091026: Suzaku WAM observation of the prompt emission
  39. GRB 091026: GROND Upper Limits
  40. GRB 091020: Late TLS detection
  41. GRB 091026: Swift-BAT refined analysis
  42. Radio afterglow detection from GRB 091020
  43. GRB 091026: Swift/UVOT Upper Limits
  44. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  45. GRB 091026: Swift-XRT refined analysis
  46. GRB 091026: Enhanced Swift-XRT position
  47. Konus-Wind and Konus-RF observations of GRB 091024
  48. GRB 091026: Updated Swift-XRT position
  49. GRB 091026: Swift detection of a Gamma Ray Burst
  50. Swift-BAT Triggers 373776-373778 are not real
  51. GRB091024 Swift/UVOT Upper Limits
  52. GRB 091024: TLS Upper Limit
  53. GRB 091020: Early TLS Multicolor detections, red afterglow
  54. GRB 091024: KAIT optical afterglow observations
  55. GRB 091024: Swift-BAT refined analysis
  56. Swift-BAT Triggers 373679-373684 are not real
  57. GRB 091024: Fermi GBM Observations
  58. GRB 091024: Swift-XRT team refined analysis
  59. Swift-BAT trigger 373691 is a galactic bulge transient
  60. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  61. GRB 091024: Faulkes Telescope North Afterglow Candidate
  62. GRB 091024: Swift detection of a burst
  63. GRB 091020: Swift-XRT refined analysis
  64. GRB 091018: Swift XRT refined analysis
  65. GRB091020 Swift/UVOT observations
  66. GRB 091020, Swift-BAT refined analysis
  67. GRB 091020: Enhanced Swift-XRT position
  68. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  69. GRB 091020: Swift detection of a burst with an optical afterglow
  70. GRB 091018: Skynet/PROMPT Observations of Fading
  71. Konus-RF observation of GRB 091018
  72. GRB 091018 : Faulkes Telescope South Observations
  73. GRB 091018: VLT/X-shooter spectra
  74. GRB091018: Swift/UVOT observations
  75. GRB 091018: Swift-BAT refined analysis
  76. GRB 091018: Enhanced Swift-XRT position
  77. GRB 091018: ROTSE-III Detection of Optical Counterpart
  78. GRB 091018: Swift detection of a burst with optical afterglow
  79. GRB 090726 R band observations
  80. GRB 091010: Swift-XRT refined analysis
  81. Radio observation of GRB090927 with ATCA
  82. GRB 091010: Fermi GBM observation
  83. GRB 090531A: Skynet/PROMPT Observations
  84. GRB 090530A: Skynet/DSO Detections
  85. GRB 091010: RXTE detection
  86. GRB 091010: Enhanced XRT position
  87. Detection of a short GRB 090929A by RT-2 Experiment
  88. GRB 091010: GROND afterglow candidate
  89. GRB 091010: Swift/UVOT Upper Limits
  90. GRB 091010: Swift-XRT position
  91. GRB 090518: Skynet/PROMPT Observations
  92. Short-Duration GRB 090621: Skynet/Dolomiti Observations
  93. GRB 090812: Skynet/PROMPT and GORT Observations
  94. GRB 091003: Lick observations and possible SDSS host galaxy
  95. GRB 090926B: Skynet/PROMPT Observations
  96. GRB 091003: WHT ACAM observations
  97. GRB 090929B: Suzaku WAM observation of the prompt emission
  98. GRB 091003: Swift-XRT confirmation of fading afterglow
  99. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  100. GRB 091003: UVOT-enhanced XRT position

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